4-inch/50-caliber gun: Difference between revisions
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{{Infobox Weapon |
{{Infobox Weapon |
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|name= 4"/50 caliber |
|name= 4"/50 caliber gun Marks 7, 8, 9, and 10 |
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|image= [[File:USS Ward 4 inch gun Minnesota Capitol.jpg|300px]] |
|image= [[File:USS Ward 4 inch gun Minnesota Capitol.jpg|300px]] |
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|caption=The gun from {{USS|Ward|DD-139|6}} which fired the [[first American shots fired in World War II|first American shot of World War II]] at [[Attack on Pearl Harbor|Pearl Harbor]] on 7 December 1941 |
|caption=The gun from {{USS|Ward|DD-139|6}} which fired the [[first American shots fired in World War II|first American shot of World War II]] at [[Attack on Pearl Harbor|Pearl Harbor]] on 7 December 1941 |
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|origin={{flag|United States|1897}} |
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|type= [[Naval gun]] |
|type= [[Naval gun]] |
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<!-- Type selection --> |
<!-- Type selection --> |
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|is_UK=yes |
|is_UK=yes |
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<!-- Service history --> |
<!-- Service history --> |
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|service= |
|service=1898 - 1945 |
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|used_by= |
|used_by=*{{Flag|United States Navy}} |
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*{{navy|United Kingdom}} |
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*{{navy|Canada|1911}} |
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*{{navy|USSR}} |
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|wars= [[World War I]] |
|wars=* [[World War I]] |
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* [[World War II]] |
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<!-- Production history --> |
<!-- Production history --> |
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|designer= |
|designer=[[Bureau of Ordnance]] |
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|design_date= |
|design_date=* Mark 7: 1898 |
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* Mark 8: 1905 |
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|manufacturer= |
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* Mark 9: 1914 |
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* Mark 10: 1914 (Did not enter service) |
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|manufacturer=*[[Washington Navy Yard|U.S. Naval Gun Factory]] |
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*[[Bethlehem Steel]] |
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*[[Midvale Steel]] |
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*[[British and American Mfg. Co.]] |
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*[[Watervliet Arsenal]] |
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*[[Root & VanDervoort]] |
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*[[American Radiator Corp.]] |
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*[[Poole Engineering]] |
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|production_date= |
|production_date= |
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|number= |
|number=*Mark 7: 89 |
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*Mark 8: 12 |
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|variants=Mk 7, 8, 9 and 10 |
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*Mark 9: 2,988 |
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*Mark 10: |
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|variants=Mark 7, 8, 9 and 10 |
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<!-- General specifications --> |
<!-- General specifications --> |
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|weight={{convert| |
|weight=* Mark 7: {{convert|5808|lb|kg}} (with breech) |
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* Mark 8: {{convert|6440|lb|kg}} (with breech) |
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* Mark 9: {{convert|5900|lb|kg}} (with breech) |
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|part_length={{convert|200|in|m|sigfig=1}} bore (50 [[Caliber#Caliber as measurement of length|calibres]]) |
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* Mark 10: {{convert|6860|lb|kg}} (with breech) |
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|length=* Mark 7: {{convert|204.5|in|m}} |
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* Mark 8 and 9: {{convert|206.53|in|m}} |
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* Mark 10: {{convert|211|in|m}} |
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|part_length=All: {{convert|200|in|m|sigfig=1}} bore (50 [[Caliber#Caliber as measurement of length|calibres]]) |
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|width= |
|width= |
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|height= |
|height= |
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|crew= |
|crew= |
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<!-- Ranged weapon specifications --> |
<!-- Ranged weapon specifications --> |
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|cartridge={{convert|33|lb|kg|sigfig=2}}<ref name="Campbell 1985 p.143">Campbell 1985 p.143</ref> |
|cartridge=*{{convert|33|lb|kg|sigfig=2}} (projectile)<ref name="Campbell 1985 p.143">Campbell 1985 p.143</ref> |
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*{{convert|62.4|–|64.75|lb|kg|sigfig=2}} (complete round) |
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|caliber={{convert|4|in|mm|sigfig=1}} |
|caliber={{convert|4|in|mm|sigfig=1}} |
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|action= |
|action= |
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|rate=8-9 |
|rate=8-9 rounds per minute |
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|velocity={{convert| |
|velocity=*Mark 7: {{convert|2500|ft/s|m/s}}<ref name="Campbell 1985 p.143"/> |
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*Mark 8: {{convert|2800|ft/s|m/s}} |
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|range= |
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*Mark 9 and 10: {{convert|2900|ft/s|m/s}} |
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|max_range={{convert|15920|yd|m}}<ref name="Campbell 1985 p.143"/> |
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|range=Mark 7: {{convert|9000|yd|m}} at 13° elevation |
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|max_range=Mark 9: {{convert|15920|yd|m}} at 20° elevation<ref name="Campbell 1985 p.143"/> |
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|sights= |
|sights= |
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<!-- Artillery specifications --> |
<!-- Artillery specifications --> |
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|recoil= |
|recoil= |
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|carriage= |
|carriage= |
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|elevation=-15 to 20 |
|elevation=-15° to +20° |
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|traverse=-150 to 150 |
|traverse=-150° to 150° |
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}} |
}} |
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The '''4"/50 caliber |
The '''4"/50 caliber gun''' (spoken "four-inch-fifty-caliber") was the standard low-angle, [[quick-firing gun]] for [[United States]], first appearing on the [[monitor]] {{USS|Arkansas|BM-7|2}} and then used on "Flush Deck" [[destroyers]] through [[World War I]] and the 1920s. It was also the standard [[deck gun]] on [[United States S-class submarine|S-class]] submarines, and was used to rearm numerous submarines built with 3" guns early in [[World War II]]. United States naval gun terminology indicates the gun fired a projectile {{convert|4|in|cm}} in diameter, and the barrel was 50 [[Caliber (artillery)|caliber]]s long (barrel length is 4 inch x 50 = 200 inches or 5 meters).<ref>Fairfield 1921 p.156</ref><ref name="friedman">{{cite book | url=https://books.google.com/books?id=yh3OAwAAQBAJ&pg | title=Naval Weapons of World War One | publisher=Seaforth Publishing | author=Friedman, Norman | year=2011 | pages=188–191 | isbn=978 1 84832 100 7}}</ref> |
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== |
==Design== |
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The original Mark 7, '''M1898''', guns No. 213–254, 257–281, 316–338, was of an entirely new high power designed [[built-up gun]] with a tube, jacket, [[Hoop gun|hoop]], locking ring and screw breech. Gun No. 213 had a liner. The gun was described as a 5-inch gun but with a 4-inch bore in the 1902 handbook, this indicated its higher power and also the fact the barrel was actually more the size of a 5"/40 caliber gun than a 4-inch gun. The ammunition was about {{convert|7|lbs}} heavier than a 4"/40 round. The Mod 1 was a Mod 0 that used a conical steel liner and the Mod 2 was either a Mod 0 or Mod 1 that was relined using a conical [[nickel-steel]] liner and a shoulder on the breech end.<ref name="friedman" /> |
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The [[built-up gun]] with a tube, full-length jacket, and side swing [[Welin breech block]] with Smith-[[Asbury mechanism]] weighed about 2.7 tons. Fixed ammunition (case and projectile handled as a single assembled unit) with a {{convert|14.5|lb|adj=on}} charge of [[smokeless powder]] gave a {{convert|33|lb|adj=on}} projectile a velocity of {{convert|2900|ft/s}}. Range was {{convert|9|mi}} at the maximum elevation of 20 degrees. Useful life expectancy was 500 [[List of British ordnance terms#Effective Full Charge | effective full charge]]s (EFC) per barrel.<ref name="Campbell 1985 p.143"/> |
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Gun No. 353 was the prototype of the Mark 8 and was test fired on 22 September 1910. This gun had been ordered 16 June 1907 and delivered in November 1907. The simplified design of the Mark 8, with just a gun tube and jacket. The jacket extended all the way to the muzzle and ended in a muzzle bell. The production run was small with only 12 guns being built, Nos. 353–364.<ref name="friedman" /> |
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The Mark 9 was a direct design resulting from tests with gun No. 353. It was designed light weight and would go on to be the standard 4-inch gun used on destroyers and submarines during WW I. The gun would use an A tube, full-length jacket, a muzzle swell with a side swing [[Smith-Asbury mechanism|Smith-Asbury breech mechanism]] and [[Welin breech block]]. The gun weighed about {{convert|2.725|LT}}. Gun No. 365, the first Mark 9, was ordered from [[Midvale Steel]] 18 October 1911. Three-hundred, ninty Mark 9's would go on to built by four different manufactuers, before the US entered WW I, starting in 1911. During the war another 1,885 gun were produced, with [[Root & VanDervoort]], [[American Radiator Company]] and [[Poole Engineering]] joining with the other pre-war manufactuers. After the war another 713 guns were produced with orders for 3538 guns cancelled. It was decided after WW I that all destroyers would carry the 4"/50 caliber Mark 9 Mod 5 gun, the refits were complteted in autumn 1921.<ref name="friedman" /> |
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The Mark 10, gun No. 365-A, was order in 1915 but does not appear to have been completed until after WW I. The initial drawings were for a 4-inch/50 caliber [[anti-aircraft warfare|anti-aircraft]] dated January and February 1915. It was disigned with a vertically sliding breech block on a built-up gun with a tube, jacket, chase hoop and locking ring, all constructed of nickel-steel, but it does not appear that the Mark 10 was put into service.<ref name="friedman" /> |
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Fixed ammunition (case and projectile handled as a single assembled unit) with a {{convert|14.5|lb|adj=on}} charge of [[smokeless powder]] gave a {{convert|33|lb|adj=on}} projectile a velocity of {{convert|2900|ft/s}}. Range was {{convert|9|mi}} at the maximum elevation of 20 degrees. Useful life expectancy was 400–500 [[List of British ordnance terms#Effective Full Charge | effective full charge]]s (EFC) for a non-chrome plated barrel, while a chrome plated barrel was listed at 600 rounds.<ref name="Campbell 1985 p.143"/><ref name="friedman" /> |
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Increasing awareness of the need for improved [[anti-aircraft]] protection encouraged mounting of [[dual purpose gun]]s on destroyers beginning in the 1930s. The dual-purpose [[5"/38 caliber gun]] became standard for United States destroyers constructed from the 1930s through [[World War II]]. United States destroyers built with 4"/50 caliber low-angle guns were rearmed with dual-purpose [[3"/50 caliber gun]]s. The 4"/50 caliber guns removed from destroyers were mounted on [[Defensively Equipped Merchant Ships]] of the [[Merchant Navy (United Kingdom)|British Merchant Navy]] and [[United States Merchant Marine]] like {{SS|Stephen Hopkins}}.<ref name="Campbell 1985 p.143"/> As [[United States S-class submarine|S-boats]] were transferred from combat patrols to training duties from mid-1942 through 1943, their 4-inch guns were removed and used to re-equip front-line submarines built with [[3"/50 caliber gun]]s. |
Increasing awareness of the need for improved [[anti-aircraft]] protection encouraged mounting of [[dual purpose gun]]s on destroyers beginning in the 1930s. The dual-purpose [[5"/38 caliber gun]] became standard for United States destroyers constructed from the 1930s through [[World War II]]. United States destroyers built with 4"/50 caliber low-angle guns were rearmed with dual-purpose [[3"/50 caliber gun]]s. The 4"/50 caliber guns removed from destroyers were mounted on [[Defensively Equipped Merchant Ships]] of the [[Merchant Navy (United Kingdom)|British Merchant Navy]] and [[United States Merchant Marine]] like {{SS|Stephen Hopkins}}.<ref name="Campbell 1985 p.143"/> As [[United States S-class submarine|S-boats]] were transferred from combat patrols to training duties from mid-1942 through 1943, their 4-inch guns were removed and used to re-equip front-line submarines built with [[3"/50 caliber gun]]s. |
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==Manufacuer list Mark 9 gun== |
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{|class="wikitable" |
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!Manufactuer |
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!Date ordered |
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!Gun Nos. |
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!Total built |
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!Notes |
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|- |
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|[[Midvale Steel]] |
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|18 October 1911 |
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|365–389 |
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|25 |
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| |
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|- |
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|[[Bethlehem Steel]] |
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|7 November 1911 |
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|390–414 |
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|25 |
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| |
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|- |
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|[[British and American Mfg. Co.]] |
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|4 February 1913 |
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|415–444 |
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|30 |
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|Mod 4 No. 432 on |
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|- |
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|[[Watervliet Arsenal]] |
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|19 April 1913 |
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|445–478 |
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|34 |
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|Mod 4 |
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|- |
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|British and American Mfg. Co. |
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|28 November 1914 |
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|479–508 |
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|30 |
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|Mod 2, Mod 5 No. 502 on |
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|- |
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|Watervliet Arsenal |
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|8 June 1915 |
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|509–538 |
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|30 |
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|Mod 2, Mod 5 No. 516 on |
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|- |
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|Bethlehem Steel |
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|31 October 1916 |
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|539–605 |
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|67 |
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|Mod 5 |
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|- |
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|British and American Mfg. Co. |
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|18 November 1916 |
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|606–705 |
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|100 |
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|Mod 5 |
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|- |
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|Watervliet Arsenal |
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|17 October 1916 |
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|706–755 |
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|50 |
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|Mod 5 |
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|- |
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|Bethlehem Steel |
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|4 April 1917 |
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|756–855 |
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|100 |
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|Mod 5 |
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|- |
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|[[Root & VanDervoort]] |
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|25 May 1917 |
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|876–1875 |
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|1000 |
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|Nos. 856-875 were not assigned |
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|- |
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|[[American Radiator Corp.]] |
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|7 June 1917 |
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|1876–2380 |
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|505 |
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|Nos. 2381-2875 were not assigned |
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|- |
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|[[Poole Engineering]] |
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|29 August 1917 |
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|2876–2994 |
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|119 |
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|Nos. 2995-3375 were not assigned |
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|- |
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|American and British Co. |
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|24 September 1917 |
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|3376–3506 |
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|131 |
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|Nos. 3507-3575 were not assigned |
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|- |
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|Watervliet Arsenal |
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|11 July 1918 |
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|3576–3605 |
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|30 |
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| |
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|} |
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The unassigned numbers mostly corresponed to gun orders that were cancelled with the signing of the Armistice.<ref name="friedman" /> |
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==US Navy service== |
==US Navy service== |
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The 4"/50 caliber gun was mounted on: |
The 4"/50 caliber gun was mounted on: |
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* {{sclass-|Arkansas|monitor|1}}s (Mark 7) |
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* {{sclass-|Cassin|destroyer|1}}s<ref name="GardinerWWIUSDD">Gardiner and Gray pp. 122-123</ref> |
* {{sclass-|Cassin|destroyer|1}}s<ref name="GardinerWWIUSDD">Gardiner and Gray pp. 122-123</ref> |
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* {{sclass-|Aylwin|destroyer|1}}s |
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* {{sclass-|O'Brien|destroyer|1}}s<ref name="GardinerWWIUSDD"/> |
* {{sclass-|O'Brien|destroyer|1}}s<ref name="GardinerWWIUSDD"/> |
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* {{sclass-|Tucker|destroyer|1}}s<ref name="GardinerWWIUSDD"/> |
* {{sclass-|Tucker|destroyer|1}}s<ref name="GardinerWWIUSDD"/> |
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* {{USS|Dolphin|SS-169}}<ref name="Fahey 1939 p.18"/> |
* {{USS|Dolphin|SS-169}}<ref name="Fahey 1939 p.18"/> |
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* numerous rearmed submarines including {{USS|Salmon|SS-182}}, {{USS|Seadragon|SS-194}}, {{USS|Gato|SS-212}}, {{USS|Silversides|SS-236}} and {{USS|Robalo|SS-273}}<ref name="Campbell 1985 p.143"/> |
* numerous rearmed submarines including {{USS|Salmon|SS-182}}, {{USS|Seadragon|SS-194}}, {{USS|Gato|SS-212}}, {{USS|Silversides|SS-236}} and {{USS|Robalo|SS-273}}<ref name="Campbell 1985 p.143"/> |
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* [[Eagle-class patrol craft]] |
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* armed yachts, patrol gunboats |
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==UK service== |
==UK service== |
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==See also== |
==See also== |
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*[[List of naval guns]] |
*[[List of naval guns]] |
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===Weapons of comparable role, performance and era=== |
===Weapons of comparable role, performance and era=== |
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*[[BL 4 inch naval gun Mk VII]] British equivalent |
*[[BL 4 inch naval gun Mk VII]] British equivalent |
Revision as of 07:09, 22 May 2016
4"/50 caliber gun Marks 7, 8, 9, and 10 | |
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Type | Naval gun |
Place of origin | United States |
Service history | |
In service | 1898 - 1945 |
Used by | |
Wars | |
Production history | |
Designer | Bureau of Ordnance |
Designed |
|
Manufacturer | |
No. built |
|
Variants | Mark 7, 8, 9 and 10 |
Specifications | |
Mass |
|
Length |
|
Barrel length | All: 200 inches (5 m) bore (50 calibres) |
Shell |
|
Calibre | 4 inches (100 mm) |
Elevation | -15° to +20° |
Traverse | -150° to 150° |
Rate of fire | 8-9 rounds per minute |
Muzzle velocity |
|
Effective firing range | Mark 7: 9,000 yards (8,200 m) at 13° elevation |
Maximum firing range | Mark 9: 15,920 yards (14,560 m) at 20° elevation[1] |
The 4"/50 caliber gun (spoken "four-inch-fifty-caliber") was the standard low-angle, quick-firing gun for United States, first appearing on the monitor Arkansas and then used on "Flush Deck" destroyers through World War I and the 1920s. It was also the standard deck gun on S-class submarines, and was used to rearm numerous submarines built with 3" guns early in World War II. United States naval gun terminology indicates the gun fired a projectile 4 inches (10 cm) in diameter, and the barrel was 50 calibers long (barrel length is 4 inch x 50 = 200 inches or 5 meters).[2][3]
Design
The original Mark 7, M1898, guns No. 213–254, 257–281, 316–338, was of an entirely new high power designed built-up gun with a tube, jacket, hoop, locking ring and screw breech. Gun No. 213 had a liner. The gun was described as a 5-inch gun but with a 4-inch bore in the 1902 handbook, this indicated its higher power and also the fact the barrel was actually more the size of a 5"/40 caliber gun than a 4-inch gun. The ammunition was about 7 pounds (3.2 kg) heavier than a 4"/40 round. The Mod 1 was a Mod 0 that used a conical steel liner and the Mod 2 was either a Mod 0 or Mod 1 that was relined using a conical nickel-steel liner and a shoulder on the breech end.[3]
Gun No. 353 was the prototype of the Mark 8 and was test fired on 22 September 1910. This gun had been ordered 16 June 1907 and delivered in November 1907. The simplified design of the Mark 8, with just a gun tube and jacket. The jacket extended all the way to the muzzle and ended in a muzzle bell. The production run was small with only 12 guns being built, Nos. 353–364.[3]
The Mark 9 was a direct design resulting from tests with gun No. 353. It was designed light weight and would go on to be the standard 4-inch gun used on destroyers and submarines during WW I. The gun would use an A tube, full-length jacket, a muzzle swell with a side swing Smith-Asbury breech mechanism and Welin breech block. The gun weighed about 2.725 long tons (2.769 t). Gun No. 365, the first Mark 9, was ordered from Midvale Steel 18 October 1911. Three-hundred, ninty Mark 9's would go on to built by four different manufactuers, before the US entered WW I, starting in 1911. During the war another 1,885 gun were produced, with Root & VanDervoort, American Radiator Company and Poole Engineering joining with the other pre-war manufactuers. After the war another 713 guns were produced with orders for 3538 guns cancelled. It was decided after WW I that all destroyers would carry the 4"/50 caliber Mark 9 Mod 5 gun, the refits were complteted in autumn 1921.[3]
The Mark 10, gun No. 365-A, was order in 1915 but does not appear to have been completed until after WW I. The initial drawings were for a 4-inch/50 caliber anti-aircraft dated January and February 1915. It was disigned with a vertically sliding breech block on a built-up gun with a tube, jacket, chase hoop and locking ring, all constructed of nickel-steel, but it does not appear that the Mark 10 was put into service.[3]
Fixed ammunition (case and projectile handled as a single assembled unit) with a 14.5-pound (6.6 kg) charge of smokeless powder gave a 33-pound (15 kg) projectile a velocity of 2,900 feet per second (880 m/s). Range was 9 miles (14 km) at the maximum elevation of 20 degrees. Useful life expectancy was 400–500 effective full charges (EFC) for a non-chrome plated barrel, while a chrome plated barrel was listed at 600 rounds.[1][3]
Increasing awareness of the need for improved anti-aircraft protection encouraged mounting of dual purpose guns on destroyers beginning in the 1930s. The dual-purpose 5"/38 caliber gun became standard for United States destroyers constructed from the 1930s through World War II. United States destroyers built with 4"/50 caliber low-angle guns were rearmed with dual-purpose 3"/50 caliber guns. The 4"/50 caliber guns removed from destroyers were mounted on Defensively Equipped Merchant Ships of the British Merchant Navy and United States Merchant Marine like SS Stephen Hopkins.[1] As S-boats were transferred from combat patrols to training duties from mid-1942 through 1943, their 4-inch guns were removed and used to re-equip front-line submarines built with 3"/50 caliber guns.
Manufacuer list Mark 9 gun
Manufactuer | Date ordered | Gun Nos. | Total built | Notes |
---|---|---|---|---|
Midvale Steel | 18 October 1911 | 365–389 | 25 | |
Bethlehem Steel | 7 November 1911 | 390–414 | 25 | |
British and American Mfg. Co. | 4 February 1913 | 415–444 | 30 | Mod 4 No. 432 on |
Watervliet Arsenal | 19 April 1913 | 445–478 | 34 | Mod 4 |
British and American Mfg. Co. | 28 November 1914 | 479–508 | 30 | Mod 2, Mod 5 No. 502 on |
Watervliet Arsenal | 8 June 1915 | 509–538 | 30 | Mod 2, Mod 5 No. 516 on |
Bethlehem Steel | 31 October 1916 | 539–605 | 67 | Mod 5 |
British and American Mfg. Co. | 18 November 1916 | 606–705 | 100 | Mod 5 |
Watervliet Arsenal | 17 October 1916 | 706–755 | 50 | Mod 5 |
Bethlehem Steel | 4 April 1917 | 756–855 | 100 | Mod 5 |
Root & VanDervoort | 25 May 1917 | 876–1875 | 1000 | Nos. 856-875 were not assigned |
American Radiator Corp. | 7 June 1917 | 1876–2380 | 505 | Nos. 2381-2875 were not assigned |
Poole Engineering | 29 August 1917 | 2876–2994 | 119 | Nos. 2995-3375 were not assigned |
American and British Co. | 24 September 1917 | 3376–3506 | 131 | Nos. 3507-3575 were not assigned |
Watervliet Arsenal | 11 July 1918 | 3576–3605 | 30 |
The unassigned numbers mostly corresponed to gun orders that were cancelled with the signing of the Armistice.[3]
The 4"/50 caliber gun was mounted on:
- Template:Sclass-s (Mark 7)
- Template:Sclass-s[4]
- Template:Sclass-s
- Template:Sclass-s[4]
- Template:Sclass-s[4]
- Template:Sclass-s[4]
- Template:Sclass-s[5]
- Template:Sclass-s[5]
- Template:Sclass-s[5]
- United States S-class submarines[6]
- the first seven Template:Sclass-s[1]
- USS Dolphin (SS-169)[6]
- numerous rearmed submarines including USS Salmon (SS-182), USS Seadragon (SS-194), USS Gato (SS-212), USS Silversides (SS-236) and USS Robalo (SS-273)[1]
- Eagle-class patrol craft
- armed yachts, patrol gunboats
UK service
Many Mark 9 guns were supplied to the United Kingdom during World War II as part of Lend-lease, both individually and on naval and merchant ships.[7] Caldwell, Wickes, and Clemson-class destroyers transferred under the Destroyers for Bases Agreement became British and Canadian Template:Sclass2-s.[8]
See also
Weapons of comparable role, performance and era
- BL 4 inch naval gun Mk VII British equivalent
Notes
- ^ a b c d e f g Campbell 1985 p.143
- ^ Fairfield 1921 p.156
- ^ a b c d e f g Friedman, Norman (2011). Naval Weapons of World War One. Seaforth Publishing. pp. 188–191. ISBN 978 1 84832 100 7.
- ^ a b c d Gardiner and Gray pp. 122-123
- ^ a b c Fahey 1939 p.14
- ^ a b Fahey 1939 p.18
- ^ Di Giulian
- ^ Lenton and Colledge 1968 pp.90-92
References
- Campbell, John (1985). Naval Weapons of World War Two. Naval Institute Press. ISBN 0-87021-459-4.
- Fahey, James C. (1939). The Ships and Aircraft of the U.S. Fleet, War Edition. Ships and Aircraft.
- Fairfield, A.P. (1921). Naval Ordnance. The Lord Baltimore Press.
- Gardiner, Robert and Gray, Randal, Conway's All the World's Fighting Ships 1906-1921 Conway Maritime Press, 1985. ISBN 0-85177-245-5.
- Lenton, H.T.; Colledge, J.J. (1968). British and Dominion Warships of World War II. Doubleday and Company.
External links
- DiGiulian, Tony, United States of America 4"/50 (10.2 cm) Marks 7, 8, 9 and 10 at Navweaps.com